John, I have the original blower carburetor and dual point blower distributor. At idle there doesn’t seem be much difference with the vacuum line hooked up or off. 15 seemed low to me, but if that is not that far off for this cam, the miss is probably ignition and not leak or cam timing.

The way the plug wires run through the insulators it is awfully easy to get wires crossed. 

Rechecked spark plug wires for firing order all looks correct, checked dwell on both sets of points, both are at 35 degrees. Will try to check compression tonight.

That cam has a slight lope and with my combo, (naturally aspirated) doesn't start to perform until about 1800rpm.  So idle to 1800rpm (mostly closer to idle speed) it does "misfire" but that's just the nature of the beast - it's how cams tend to work as they get bigger.  This is more pronounced when the vacuum advance is not used, which I think is the case with a supercharged engine, is that right?  Make sure you're not confusing something like that as a problem.


Lawrenceville, GA

The distributor used with blower does use a vacuum advance together with centrifugal advance.

"The distributor used with blower does use a vacuum advance together with centrifugal advance."

... hmmpf ...

Interesting. So it uses a H4000 with a 57 dual advance distributor? Is the advance signal ported or manifold vacuum?



Did any F-CODE variation use only a mechanical advance distributor (HOLLEY - MALLORY)?  Was there a STREET VERSION and a RACE VERSION?      

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I only know of the factory distributors. The tubing in your picture running from front of carb to distributor with the large loop is correct.

Issue is not compression, cylinders read, 130, 132, 135, 135, 140, 133, 130, 135 in order 1-8. With the blower heads the compression should be 120-130.

Could be rotor phasing is off in the distributor, I've heard talk that people fabricate the dual point breaker plates from the stock single point ones. That could be pretty tricky to do that accurately. I would check it dynamically using a timing light with the hole in the cap method.

I may be off base here but 35 on each set seem high. I've only run factory dual points on my FE and set at 28 each and then the total comes out about 32. Too much dwell may not be letting the coil build up enough and causing a week spark?